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  • 1
    ISSN: 1432-1203
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Description / Table of Contents: Zusammenfassung In Fortsetzung unserer Untersuchungen über die Häufigkeit der genetisch determinierten Varianten der Lactat-Dehydrogenase (LDH) in der indischen Population wurde einiges Material gesammelt, das sich zur Untersuchung des Problems eignet, ob Häufigkeitsunterschiede nach Kasten und Alter für das Vorkommen der häufigen Variante LDH Cal-1 unter den Hindus in Bengalen bestehen. Es handelt sich um eine rasche Variante der A-Untereinheit.
    Notes: Summary In continuing our studies on the incidence of the genetically determined variants of Lactate dehydrogenase (LDH) among the Indian populations, it has been possible to collect some suitable material presented here to examine the question of caste and age variations in the incidence rates of the commonly occurring variant, LDH Cal-1, among the Bengali Hindu. It is a “Faster A-subunit variant”.
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  • 2
    ISSN: 1432-1203
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary 17 examples of genetically controlled variation of LDH have been encountered in a survey of 1331 Indian blood samples collected in Calcutta and Madras. 15 of the variants (10 in Calcutta and 5 in Madras) were identical and have been given the trivial name ‘Calcutta-1’. The other 2 examples were found in Madras and have been called ‘Madras-1’. ‘Calcutta-1’ is an A-subunit variant, whilst ‘Madras-1’ is a B-subunit variant. The overall frequency of LDH variants in India (1.28 per cent) is among the highest reported for any population in the world.
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  • 3
    ISSN: 1432-0789
    Keywords: Methane emission ; Flooded rice field ; Varietal variation ; Root oxidase activity ; Diurnal variation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract In a study on CH4 emission from flooded rice fields under irrigated conditions, fields planted with rice emitted more methane than unplanted fields. The CH4 efflux in planted plots varied with the rice variety and growth stage and ranged from 4 to 26 mg h-1m-2. During the reproductive stage of the rice plants, CH4 emission was high and the oxidation power of rice roots, in terms of α-naphthylamine oxidation, was very low. The CH4 emission reached a maximum at midday and declined to minimum levels at midnight, irrespective of the rice variety. The peak CH4 emission at midday was associated with higher solar radiation and higher soil/water temperature.
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  • 4
    ISSN: 1432-0800
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
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  • 5
    ISSN: 1432-1181
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The present analysis gives an account of exergy destruction in regenerative heat exchangers used in cryogenic applications from the view point of Second Law of Thermodynamics. Unlike the previous studies, the present work considers the solid storage matrix with temperature variation along both spatial and temporal co-ordinates. The present analysis also considers the effect of matrix longitudinal heat conduction on the Second Law behaviour. Finite longitudinal conductivity, which results from the distribution of temperature in the matrix, acts as a major non-ideality associated with the analyses done so far. The present analysis shows that the introduction of longitudinal conduction ensures the optimization of charging period for the regenerator. This makes it possible to optimize the regenerator performance globally to produce optimum combination of N tu and charging time. It is also observed that a decrease in longitudinal conductivity reduces the optimum charging time. Thus the non-existence of thermodynamic optima at the absence of longitudinal conduction is explained adequately.
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  • 6
    ISSN: 1432-1181
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Description / Table of Contents: Zusammenfassung  Rohrbündelapparate sind die am häufigsten verwendeten Wärmeübertrager. Während main in der Literatur zahlreiche Arbeiten über ihr stationäres thermisches Verhalten findet, liegen nur vergleichsweise wenige Arbeiten über ihr instationäres Verhalten vor. In der vorliegenden Arbeit wird das instationäre Verhalten eines Rohrbündelwärmeübertragers mit einem Durchgang unter Vernachlässigung der Wärmekapazität der Rohrwand untersucht. Zur Modellbildung wird ein Ansatz mit verteilten Parametern verwendet. Anders als bei einigen neueren Arbeiten inder Literatur erfolgt die Lösung nicht numerisch sondern analytisch unter Verwendung der Laplacetransformation. Dies liefert eine eindeutige Darstellung der Antwortfunktion und erleichtert damit die Auswahl geeigneter Regelstrategien. Für das Gleichstrommodell wird eine Regelstrategie unter Verwendung eines PID-Reglers formuliert.
    Notes: Abstract  The shell and tube heat exchangers constitute the single largest component of the heat exchanger family. Though a vast number of literature is available for their steady state analyses, the number of works on transient analysis are comparatively fewer. The present paper brings out the transient response of a single pass shell and tube heat exchanger neglecting wall heat capacitance. The model is constructed with a distributed parameter approach. Unlike a number of recent analyses the numerical technique is avoided and the path of double Laplace transform has been chosen instead. This gives a scope for a unique functional representation of the response which is useful for deciding the control strategies to be adopted. This strategy has been formulated for the parallel flow model using PID controllers.
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  • 7
    ISSN: 1432-1203
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Description / Table of Contents: Zusammenfassung 392 Blutproben von Mundas aus christlichen und nichtchristlichen Gruppen, aus Ranchi (Bihar) wurden mit Hilfe der Filterpapiertechnik gesammelt und auf LDH-Varianten gestestet. 6 Fälle (1,53%) der Variante LDH Cal-1 wurden entedeckt. Dieser Wert wird verglichen mit dem von Hindus höherer und niederer Kasten aus West-Bengalen. Die Mundas ähneln den unteren Kasten mehr als den höheren (t=1,752; 0,05〉 P〉0,025).
    Notes: Summary LDH variants were tested for in 392 bloods samples taken from Christian and non-Christian Munda groups, of Ranchi, Bihar by the “filter paper technique”. Six cases of LDH Cal-1 variant were detected (1.53%). This result is compared with that obtained in Hindu upper caste and Hindu lower caste of West Bengal, and the Munda population was found to be closer to the lower caste people than the upper caste (t=1.752, 0.05〉 P〉0.025).
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  • 8
    ISSN: 1432-1181
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Description / Table of Contents: Zusammenfassung Rohrbündelapparate sind die am häufigsten verwendeten Wärmeübertrager. Während main in der Literatur zahlreiche Arbeiten über ihr stationäres thermisches Verhalten findet, liegen nur vergleichsweise wenige Arbeiten über ihr instationäres Verhalten vor. In der vorliegenden Arbeit wird das instationäre Verhalten eines Rohrbündelwärmeübertragers mit einem Durchgang unter Vernachlässigung der Wärmekapazität der Rohrwand untersucht. Zur Modellbildung wird ein Ansatz mit verteilten Parametern verwendet. Anders als bei einigen neueren Arbeiten inder Literatur erfolgt die Lösung nicht numerisch sondern analytisch unter Verwendung der Laplacetransformation. Dies liefert eine eindeutige Darstellung der Antwortfunktion und erleichtert damit die Auswahl geeigneter Regelstrategien. Für das Gleichstrommodell wird eine Regelstrategie unter Verwendung eines PID-Reglers formuliert.
    Notes: Abstract The shell and tube heat exchangers constitute the single largest component of the heat exchanger family. Though a vast number of literature is available for their steady state analyses, the number of works on transient analysis are comparatively fewer. The present paper brings out the transient response of a single pass shell and tube heat exchanger neglecting wall heat capacitance. The model is constructed with a distributed parameter approach. Unlike a number of recent analyses the numerical technique is avoided and the path of double Laplace transform has been chosen instead. This gives a scope for a unique functional representation of the response which is useful for deciding the control strategies to be adopted. This strategy has been formulated for the parallel flow model using PID controllers.
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  • 9
    ISSN: 1432-1203
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Description / Table of Contents: Zusammenfassung Bei 104 Hindu-Mahishya-Bengalen und 123 Muslim-Bengalen aus West-Bengalen (Indien) wurde eine Erhebung über die Serumgruppen Pi, Cp, Hp und Tf durchgeführt. Die Häufigkeit des PiM-Allels ist sehr hoch (über 99%) in beiden Bevölkerungen. Die Allele CpA oder CpB sind in der indischen Bevölkerung selten; sie wurden jedoch in dieser Studie gefunden. Die Hp1-Genhäufigkeiten in beiden Bevölkerungen bewegen sich in dem Bereich, der bisher schon für andere indische Bevölkerungen wurde (5–22%). Außer CC sind alle Tf-Varianten in der indischen Bevölkerung selten; jedoch fand sich in den beiden untersuchten Bevölkerungen eine nicht unbeträchtliche Häufigkeit von CD (fast 3%). Die beiden untersuchten Gruppen sind homogen bezüglich der Verteilung der Allele in den verschiedenen Systemen; eine Ausnahme macht hier nur das Haptoglobin (ϰ=5.533, 1df).
    Notes: Summary A survey of serum Pi, Cp, Hp and Tf was carried out in 104 Bengali Hindu Mahishya and 123 Bengali Muslim of West Bengal, India. The frequency of PiM allel was very high (over 99%) in both populations. The alleles CpA or CpB are rare in Indian populations, but have been detected in the present study. The Hp1 gene frequencies obtained in both populations was within the range so far found in other Indian populations (5% to 22%). Any Tf variant other than CC is rare in Indian populations but an appreciable frequency of CD (nearly 3%) was detected in both our populations. The two groups studied here appear to be homogenous in respect of the distribution of the alleles in the various systems, except for haptoglobin (ϰ=5.533, 1 df).
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  • 10
    ISSN: 1432-2242
    Keywords: Intergeneric somatic hybridisation ; Brassica ; Diplotaxis ; Somatic hybrid
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The need to transfer genetic traits from Diplotaxis muralis (2n=42) to Brassica juncea (2n=36), a major oil seed crop of the tropical world, was realised. Since the two plant types are sexually incompatible, attempts were made to evolve parasexual hybrids as the result of protoplast fusion. Protoplasts of hypocotyl-derived calli of two cultivars of B. juncea were fused with normal and γ-irradiated mesophyll protoplasts of Diplotaxis muralis. Regeneration of 110 plants from the fused products was successfully achieved. Upon analysis of some of them, we realised that true somatic hybrids and partial somatic hybrids had been generated. Thus the primary goal of evolving intergeneric hybridisation products between these two plant types was fulfilled.
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